walinejs Waline up to 3.15.2 Comment Editor utils/markdown.ts orig cross site scripting

Summaryinfo

A vulnerability was found in walinejs Waline up to 3.15.2 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file utils/markdown.ts of the component Comment Editor. The manipulation of the argument orig results in cross site scripting. This vulnerability is known as CVE-2026-64670. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in walinejs Waline up to 3.15.2. Affected is an unknown code of the file utils/markdown.ts of the component Comment Editor. The manipulation of the argument orig with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

Waline is a comment system with backend support. In versions 3.15.2 and prior, @waline/client renders the comment editor's live preview with marked and no sanitizer (utils/markdown.ts), and the preview is injected with v-html. When a comment is edited, the editor is seeded with the comment's raw, un-sanitized body (orig). Only administrators and the comment owner can edit. So an administrator who clicks Edit on an attacker's comment renders that attacker's raw HTML in their own session: an unauthenticated commenter achieves privilege-escalation stored XSS against a moderator with a single Edit click. At time of publication, there are no publicly available patches.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-64670 since 07/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• walinejs

Name

• Waline

Version

• 3.15.0
• 3.15.1
• 3.15.2

Website

• Product: https://github.com/walinejs/waline/

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